At the heart of every optical transceiver lie three essential components, often called the “Three Pillars” of optical communication: Laser — generates light. Modulator — encodes data onto the light. The optical module is one of the core devices of the optical communication system, and its development has a vital impact on its related industrial chain, from the upstream industry chip substrate, PCB to the downstream telecom market and data communication market, and the field of lidar driverless. Optical modules are essential components in modern communication networks, enabling high-speed data transmission over fiber optic cables. As the demand for faster and more reliable internet and data services grows, understanding these devices becomes increasingly important. This guide will explore. The optical module, known as Optical Transceiver in English, is a general term for various module categories, including optical receiver modules, optical transmitter modules, optical transceiver modules, and optical forwarding modules. Its primary function is to achieve optoelectronic conversion by converting electrical signals into optical signals and vice versa. 2T, and unpacking the cutting-edge technologies shaping their future.